Chuck D. Bones
Circuit Wizard
More like this month on the breadboard. I struggled with this one for a while. Dan's demo showed us what a Dr. Robert is supposed to sound like and that provided the guidance I sorely needed. The goal of this mod was to:
Knobs, L-R: VOLUME, MACH SCHAU, TREBLE, MIDS, BASS, GAIN
You can see some candidate JFETs scattered around the bottom of the pic along with three 2N2222As that were kicked to the curb for being too noisy. I eventually installed 2N5089s for Q1-Q3 and the hiss went away. With a 9V rail, there is just as much gain and the output is just as loud as the Dr. Robert.
- Ditch the charge pump
- Have just one stomp switch
- Bring the BASS, TREBLE & BOOST controls to the front panel
- Make something that would fit into a 125B box
Knobs, L-R: VOLUME, MACH SCHAU, TREBLE, MIDS, BASS, GAIN
You can see some candidate JFETs scattered around the bottom of the pic along with three 2N2222As that were kicked to the curb for being too noisy. I eventually installed 2N5089s for Q1-Q3 and the hiss went away. With a 9V rail, there is just as much gain and the output is just as loud as the Dr. Robert.